History of Aviation, Rare Stamps and Postal History of the World, Part 2
Lot 774:
1919, two surcharges on Austrian air post stamps, 1.50k on 2k lilac and 2.50k on 3k ocher, used on pre-printed banking envelope locally sent in Prague, wax seal on reverse, VF, Est. $250-$300 , Sc. #B37-38
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